Well, he may not take much part in terms of action, but that doesn't mean that he won't get screen time. He could wind up focusing on world-building for a while, or just start getting to know some of the other people. He's going to have to meet them sooner or later, after all.

I don't remember where I read it, but it was said that she could heal herself by using other peoples energy as well as use her own to heal others. so it is possible that she will continue to aid Bast until fully healed. As we have seen, even if something is not her fault, she still takes personal responsibility for what happens to others. For example, what happened to Mr. Peaks at the library when she asked about the nightmares.